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Evaluation of Low-Overhead Organizations for the Directory in Future Many-Core CMPs

Summary: Evaluation of Low-Overhead Organizations for the
Directory in Future Many-Core CMPs
Alberto Ros1
and Manuel E. Acacio2
Dpto. de Inform´atica de Sistemas y Computadores
Universidad Polit´ecnica de Valencia, 46022 Valencia (Spain)
Dpto. de Ingenier´ia y Tecnolog´ia de Computadores
Universidad de Murcia, 30100 Murcia (Spain)
aros@gap.upv.es, meacacio@ditec.um.es
Abstract. If current trends continue, today's small-scale general-purpose CMPs will soon
be replaced by multi-core architectures integrating tens or even hundreds of cores on-
chip. Most likely, some of these many-core CMPs will implement the hardware-managed,
implicitly-addressed, coherent caches memory model. Cache coherence in these designs
will be probably maintained through a directory-based cache coherence protocol imple-
mented in hardware. The organization of the directory structure will be a key design point
due to the requirements in area that it will pose. In this work, we study the effects on
performance, network traffic and area that the use of compressed sharing codes for the
directory will have in many-core CMPs. In particular, we select two compressed sharing


Source: Acacio, Manuel - Departamento de Ingenieria y Tecnologia de Computadores, Universidad de Murcia


Collections: Computer Technologies and Information Sciences